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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2017
Accounting Policies [Abstract] |
Schedule of consolidated entities | As of September 30, 2017, the operating partnership has determined that three of its joint ventures met the definition of a VIE and are consolidated:
Property |  | Ownership interest |
Pinnacle I(1) |  | 65.0 | %
Pinnacle II(1) |  | 65.0 | %
1455 Market Street |  | 55.0 | %
Hill7 |  | 55.0 | %
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(1) | A single joint venture owns both Pinnacle I and Pinnacle II. The Company entered into an agreement on September 14, 2017 to sell its ownership interest in Pinnacle I and Pinnacle II. The sale is expected to close in the fourth quarter of 2017.
Schedule of recently issued accounting pronouncements | The following ASUs were adopted by the Company in 2017:
Standard |  | Description |  | Effect on the Financial Statements or Other Significant Matters
ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment |  | This guidance removes step two from the goodwill impairment test. As a result, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. |  | The Company early adopted this guidance during the second quarter of 2017 and applied it prospectively. The adoption did not have an impact on the Company’s consolidated financial statements.
ASU 2017-03, Accounting Changes and Error Corrections (Topic 250) and Investments—Equity Method and Joint Ventures (Topic 323): Amendments to SEC Paragraphs Pursuant to Staff Announcements at the September 22, 2016 and November 17, 2016 EITF Meetings (SEC Update) |  | The guidance in this ASU is based on two SEC staff announcements made at the September 2016 and November 2016 EITF meetings. In the September meeting, the SEC announced that a registrant should disclose the potential material effects of the ASUs related to revenues, leases and credit losses on financial instruments. As a result of the November meeting, the ASU conforms Accounting Standards Codification (“ASC”) 323 to the guidance issued in ASU 2014-01 related to investments in qualified affordable housing projects. |  | The Company adopted this guidance during the first quarter of 2017 and applied it prospectively. With the adoption, the Company provided updates on its implementation of the ASUs related to revenue, leases and credit losses on financial instruments. Please refer to sections below for updates on the implementation of revenue and lease ASUs. The ASU related to credit losses on financial instruments could have a material impact on trade receivables and the Company is currently assessing the impact of this ASU on its consolidated financial statements and notes to the consolidated financial statements.
ASU 2016-19, Technical Corrections and Improvements |  | The technical corrections make minor change to certain aspects of the FASB ASC, including changes to resolve differences between current and pre-Codification guidance, updates to wording, references to avoid misapplication and textual simplifications to increase the Codification’s utility and understandability and minor amendments to guidance that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. |  | The Company adopted this guidance during the first quarter of 2017 and applied it prospectively. The adoption did not have a material impact on the Company’s consolidated financial statements.
ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force) |  | This guidance requires entities to include restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows. |  | The Company early adopted this guidance during the second quarter of 2017 and applied it retrospectively. Pursuant to the adoption, the Company revised the Consolidated Statement of Cash Flows and disclosed the reconciliation to the related captions in the Consolidated Balance Sheets in Note 19.
Standard |  | Description |  | Effect on the Financial Statements or Other Significant Matters
ASU 2016-17, Consolidation (Topic 810): Interests Held through Related Parties That Are under Common Control |  | This guidance outlines how a single decisionmaker of a VIE should treat indirect interests held through other related parties that are under common control with the reporting entity when determining whether it is the primary beneficiary of that VIE. |  | The Company adopted this guidance during the first quarter of 2017 and applied it retrospectively. The adoption did not have a material impact on the Company’s consolidated financial statements and did not change the consolidation conclusion.
ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments |  | This ASU clarifies how certain transactions should be classified in the statement of cash flows, including debt prepayment costs, contingent consideration payments made after a business combination and distributions received from equity method investments. The ASU provides two approaches to determine the classification of cash distributions received from equity method investments: (i) the “cumulative earnings” approach, under which distributions up to the amount of cumulative equity in earnings recognized will be classified as cash inflows from operating activities, and those in excess of that amount will be classified as cash inflows from investing activities and (ii) the “nature of the distribution” approach, under which distributions will be classified based on the nature of the underlying activity that generated cash distributions. The guidance requires a Company to elect either the “cumulative earnings” approach or the “nature of the distribution” approach at the time of adoption. |  | The Company early adopted this guidance during the second quarter of 2017 and applied it retrospectively. Pursuant to the adoption, the Company elected the “nature of the distribution” approach related to the distributions received from its equity method investments. The adoption did not have an impact on the Company’s Consolidated Statements of Cash Flows.
ASU 2016-07, Investments—Equity Method and Joint Ventures (Topic 323), Simplifying the Transition to the Equity Method of Accounting |  | The guidance eliminates the requirement that an investor retrospectively apply equity method accounting when an investment that it had accounted for by another method initially qualifies for use of the equity method. The guidance also requires an investor that has an available-for-sale security that subsequently qualifies for the equity method to recognize in net income the unrealized holding gains or losses in accumulated other comprehensive income related to that security when it begins applying the equity method. It is required to apply this guidance prospectively. |  | The Company adopted this guidance during the first quarter of 2017 and applied it prospectively. The adoption did not have a material impact on the Company’s consolidated financial statements.
ASU 2016-05, Derivatives and Hedging (Topic 815), Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships |  | The guidance states that the novation of a derivative contract (e.g., a change in the counterparty) in a hedge accounting relationship does not, in and of itself, require de-designation of that hedge accounting relationship. The hedge accounting relationship could continue uninterrupted if all of the other hedge accounting criteria are met, including the expectation that the hedge will be highly effective when the creditworthiness of the new counterparty to the derivative contract is considered. Either a prospective or a modified retrospective approach can be applied. |  | The Company adopted this guidance during the first quarter of 2017 and applied it prospectively. The adoption did not have a material impact on the Company’s consolidated financial statements.
Schedule of new accounting pronouncements | The following table lists the recently issued ASUs that have not been disclosed in the Company’s 2016 Annual Report on Form 10-K and have not been adopted by the Company. The list excludes those ASUs that are not expected to have a material impact on the Company’s consolidated financial statements.
Standard |  | Description |  | Effective Date |  | Effect on the Financial Statements or Other Significant Matters
ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities |  | The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. Therefore, a cumulative effect adjustment related to elimination of ineffectiveness measurement is required to be recorded to the opening balance of retained earnings as of the beginning of the fiscal year of adoption for cash flow hedge. The guidance also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. This guidance must be applied using a modified retrospective approach. |  | Effective for annual reporting periods (including interim periods) beginning after December 15, 2018 |  | The Company is currently evaluating the impact of this standard on its consolidated financial statements and notes to the consolidated financial statements. The Company expects that the adoption would impact derivative instruments that have portions of ineffectiveness. The Company plans to early adopt this guidance during the first quarter in 2018 and apply it using the modified retrospective approach.
ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting |  | The guidance clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. This guidance must be applied prospectively. |  | Effective for annual reporting periods (including interim periods) beginning after December 15, 2017 |  | The Company does not currently expect a material impact of this ASU on its consolidated financial statements and notes to the consolidated financial statements. The Company plans to adopt this guidance during the first quarter in 2018.
ASU 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets |  | The guidance updates the definition of an in substance nonfinancial asset and clarifies the scope of ASC 610-20 on the sale or transfer of nonfinancial assets to noncustomers, including partial sales. It also clarifies the derecognition guidance for nonfinancial assets to conform with the new revenue recognition standard. Either a full or modified retrospective approach can be applied. |  | Effective for annual reporting periods (including interim periods) beginning after December 15, 2017 |  | The Company currently expects that the adoption of this ASU could have a material impact on its consolidated financial statements; however, such impact will not be known until the Company disposes of any of its investments in real estate properties, which would all be sales of nonfinancial assets. The Company plans to adopt this guidance during the first quarter in 2018 and apply it using the modified retrospective approach.

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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- Definition Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6228884-111685 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685 + Details
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